I want to display a different set of categories depending on what page. I was wondering if that can be done with some if THENs as I will link each set to a top navigation button.

I don't know if that can be accomplished by modifying the standard category sidebox or do I have to write a new module from scratch?

My problem is have SOOOOOOOO many categories so the list goes to the bottom and is way too LOOOONG!